Method of and apparatus for removing superfluous bronze.



No. 885,491. PATENTED APR. 21, 1908.

H. LAMBBRGBR.

1 METHOD OF AND APPARATUS FOR REMOVING SUPBRFLUOUS BRONZE APPLICATION Hum mm: 22, 1907.

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HANS LAMBERGER, OF LEIPZIG, GERMANY.

METHOD OF AND APPARATUS FOR REMOVING SUPERFLUOUS BRONZE.

Specification of Letters Patent.

Application filed June 22,

Patented April 21, 1908.

1907. Serial No. 380,303.

I 0 all whom it may concern:

Be it known that 1, Thus LAMBERGER, general manager, citizen of Germany, subject of the King of Bavaria, residing at Leipzig, in the Kingdom of Saxony and Empire of Germany, have invented certain new and useful Improvements in Methods of and Apparatus for Removing superfluous Bronze, of which the following is a full, clear, and ex act description.

This invention relates to a process and an apparatus for dusting sheets of any kind of paper, or of cardboard, sheet metal, celluloid, gelatin or the like which may be used either separately or in connection with cylindrical or flat apparatus for applying bronze, talc or other powder or rubbing in the same.

The essential features of the invention consist in the simultaneous use of dusting rollers that run in the direction of movement of the sheet and of dusting rollers that run in the opposite direction. Bronzers are already known wherein pairs of rollers running in the same direction as the sheet and in the opposite direction are used to bronze and dust stiff materials, such as cardboard covers, sheet metal and the like. In such. apparatus, however, the rollers running in the one direction are used only for bronzing and guiding the sheets, while the rollers running in the opposite direction are used solely for dusting. The apparatus to which this invention relates differs from such known arrangements inasmuch as by means of the rollers running in the opposite directions any material however soft, such, for instance, as tissue paper and other thin sheets can be dusted; this being effected by an arrangement according to which the dusting rollers which run in the direction opposite to that of the sheet are moved apart from each other until the sheet has been gripped by the guide rollers lying in front of them. The complete cleaning of the sheet, including the narrow strip which being gripped by the guide rollers has not been cleaned by the first pair of rollers is effected by means of the succeeding pair of dusting rollers, which run in the same direction as the sheet,

In the accompanying drawing, Figure 1 is 'a vertical longitudinal section of an apparatus embodying the invention. Fig. 2 is a side elevation of the separable dusting rollers and means for separating the same.

The operation of the apparatus is as follows :The sheet 71 after it has been introduced through the aperture a is by means of cords Z which pass over the rollers b, d and c, conveyed between the guide-rollers Z) towards the guide-rollers c; the two dusting rollers (Z, which lie between I) and c and rotate in a direction contrary to that of the movement of the sheet being meanwhile moved apart by means of a suitable contrivance g. The rollers d are mounted in arms g, which are provided with toothed sectors, so that when the lower roller (1 is moved by means of a suitable contrivance in the direction of the arrow, a corresponding movement of the upper roller is positively effected. As soon as the rollers e have gripped the sheet, the two rollers d are again brought together both on its upper and on its lower side to remove the superfluous powder which is caught in the receptacle m or drawn off upwards by suction in the direction of the sheets not yet cleaned. The sheet is now passed by means of the pair of guide rollers 0 over the perforated sheet metal plates 0 and through the pairs of rollers c and f which rotate at a somewhat greater speed in the direction of its movement. The last particles of powder or the like being by this means removed and either by suction, drawn oil or allowed to fall through the perforated plates 0 into the receptacle m. which the individual pairs of rollers are separated from each other prevent the powder from passing from one roller to the other. The sheet passes at it completely out of range of the dusting device.

Claims.

1. The method of dusting a sheet consisting in feeding the sheet and simultaneously dusting it in the direction it is being fed and in an opposite direction.

2. A sheet dusting apparatus of the character described comprising a pairof initial dusting rollers both of which move in the direction opposite to that of the sheet and a pair of dusting rollers both of which run in the same direction as the sheet and are adapted to grip and draw the sheet forward.

A sheet dusting apparatus of the char acter described having guide rollers and dusting rollers which rotate in the direction of travel of the sheet and a pair of dusting rollers which run in an opposite direction to the travel of the sheet the latter being arranged to such an extent as to operate on the sheet The sheets a by means of and adapted to be moved a art until the 1 its roller is moved in one direction the movesheet is engaged and moved orWard by the 1 ment of the other roller in the opposite direcnearest guide rollers. tion is positively effected.

4. An apparatus of the character described In Witness whereof, I subscribe my signa- 5 having a pair of dusting rollers arranged and cure, in presence of two Witnesses.

adapted to rotate in a direction opposite to the travel of the sheet, tWo arms on which HANS LAMBEIFGER' said rollers are mounted, said arms being pro- Witnesses: videdwith toothed sectors engaging with each RUDOLPH- FRIGKE,

10 other in such manner that When one arm and SOUTHARD P. WARNER. 

